The "mlp" could refer to a specific person's initials, a location, or another identifier not immediately obvious without opening the file.
Likely a vacation album ("vacation") from a social media platform, possibly Facebook ("fb"), curated or shared around July 2010 ("07_10") [1]. fb-photo-vacation-mlp-07_10.rar
Photos or images, indicated by "photo" in the filename. The "mlp" could refer to a specific person's